基于同轴菲涅耳全息的标识印刷防伪技术

在研究双随机相位数据加密技术的基础上,结合数字全息技术和印刷技术的特点,提出了一种新的同轴菲涅耳全息标识防伪方法,利用双随机相位加密复数数据信息(物光信息),与参考光叠加形成同轴全息图像。理论分析了同轴菲涅耳全息方法能有效地恢复原始图像数据,并对加密的同轴菲涅耳全息图像的强抗位压缩性能进行了仿真,最后通过打印和扫描对同轴菲涅耳全息标识的防伪功能进行了验证。结果表明,该全息标识防伪方法具有强的抗位压缩能力,可以通过逆菲涅耳变换和多重解密密钥恢复原始认证信息,是一种十分有效的全息标识。该全息标识方法可通过可变数据印刷技术印制在证件等印刷品中作为个性化防伪标识。

Identification Mark of Encrypted In-Line Fresnel Holography

It is a higher security technology that the data are encrypted by double-random phase encoding with uniformly distributed random phase.A new encrypted in-line Fresnel holographic mark is proposed based on the double-random phase encoding method,the holography and the digital printing technology.Theoretic and computer simulation prove that the encrypted in-line Fresnel holographic mark has the characteristics of availability and security.Computer simulations also indicate the encrypted in-line Fresnel holographic mark can he compressed with higher compressive ratio.Experimental results on the printing and scanning processes are presented to demonstrate that the proposed encrypted in-line Fresnel holographic mark can be printed on print matter by printer or digital printing machine as an identification mark.